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ACQUISITIONS - RONALD N. LAZZARO, P.C. NARRATIVE (Details) - USD ($)		12 Months Ended
	Dec. 02, 2016	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill	$ 58,036,000	$ 403,106,000	$ 323,943,000	$ 264,742,000
Ronald N. Lazzaro, PC
Business Acquisition [Line Items]
Total consideration paid	10,200,000
Future contingent liability	3,400,000
Goodwill	5,500,000
Acquisition related costs		$ 287,000	$ 0
Ronald N. Lazzaro, PC | Customer relationship intangible
Business Acquisition [Line Items]
Finite-lived intangible asets	$ 4,700,000
Finitel-lived intangible asset, weighted average useful life	10 years

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